Effect of fibre orientation on the vibration characteristics of orthotropic annular plates
About: This article is published in Journal of Sound and Vibration.The article was published on 1988-03-22. It has received 3 citations till now. The article focuses on the topics: Orientation (graph theory) & Orthotropic material.
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TL;DR: In this article, a nonlinear analytical model for vibration analysis of partially cracked thin orthotropic plate as affected by the fibre orientation and arbitrary position of a partial crack is presented, which is based on the classical plate theory and the effect of microstructure is incorporated using the modified couple stress theory.
27 citations
TL;DR: In this paper, the authors developed a new analytical model for vibration analysis of cracked-submerged orthotropic micro-plate affected by fibre orientation and thermal environment, which is based on Kirchhoff's classical thin plate theory and the size effect is introduced using the modified couple stress theory.
Abstract: To develop a new analytical model for vibration analysis of cracked-submerged orthotropic micro-plate affected by fibre orientation and thermal environment. The proposed analytical model is based on Kirchhoff’s classical thin plate theory and the size effect is introduced using the modified couple stress theory. Effect of crack is deduced using appropriate crack compliance coefficients based on line spring model while the effect of thermal environment is introduced in terms of thermal in-plane moments and forces. The coupling of shear and normal stresses for fibre orientation is represented using the coefficient of mutual influence. The fluid forces associated with its inertial effects are added in the governing differential equation to incorporate the fluid–structure interaction effect. The results are presented for frequency response as affected by different fibre orientation, crack length, crack location, level of submergence, temperature variation and material length-scale parameter for simply supported boundary condition. Furthermore, to study the phenomenon of shifting of primary resonance in a cracked micro-plate, the classical relations for central deflection of plate is also proposed. The results show that the fundamental frequency of micro-plate decreases by the presence of crack and thermal environment and this decrease in frequency is further intensified by the presence of surrounding fluid medium in present study. Another important conclusion is that with increase in temperature variation the reduction in frequency at 45° of fibre orientation is less when compared to 0 and 90° for both intact and cracked orthotropic plates.
7 citations
Journal Article•
TL;DR: In this article, the buckling behavior of polar and rectangular orthotropic annular disks subjected to a concentrated tangential load acting on the outer edge was analyzed. But some aspects of their buckling behaviour have not been addressed.
Abstract: Circular and annular disks are one of the most commonly used shapes of components in machinery and hence the behavior of these is of utmost interest. Consequently, we find that circular disks have been analyzed extensively. Yet some aspects of their buckling behavior have not been addressed. The aim of the present work is to analyze polar and rectangular orthotropic annular disks subjected to a concentrated tangential load acting on the outer edge. The effect of variation in dimensions, elastic properties, point of load application and number of layers with different fiber orientations is considered. Non-dimensionalized results are presented in the form of graphs and an attempt is made to analyze the observed behavior.
Cites background or result from "Effect of fibre orientation on the ..."
...Similar work with respect to orthotropic disks has been reported by Soamidas and Ganesan (1988, 1989a, 1989b, 1995), but they too have not analyzed the buckling of annular disks under concentrated edge loads....
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...Later Gorman (1983), Satyamoorthy (1984), Lakshminarayana (1986), Gupta, et al (1986), Soamidas and Ganesan (1988, 1989a, 1989b, 1995), Thyagarajan (1989), Malhotra (1989), Mermertas and Belek (1994), Chen and Jhu (1996), Lee, et al (1998), Arnold, et al (2002), Deshpande and Mote (2003), DasGupta…...
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References
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TL;DR: In this paper, a semi-analytical, one-dimensional finite element model was developed using a Fourier series approach to account for the circumferential behaviour of annular disks, which can be readily coded into any general purpose finite element program.
14 citations
TL;DR: In this paper, a flywheel of high energy density by increasing both rotating speed and moment of inertia of the disc is investigated, and the optimal shape of the flywheel is numerically sought by varying the dimensions of the hub and the rim.
9 citations
TL;DR: In this article, a fiber-reinforced plastic spur gear was made by arranging long carbon fibers along the tooth shapes and then filling up inside with composite of glass fiber chops and epoxy resin.
Abstract: This paper describes an investigation about the possibility of producing a fiber-reinforced plastic gear which is light, self-lubricated and of high strength, by taking advantage of the characteristics of the unidirectionally reinforced lamina. A fiber-reinforced plastic spur gear was molded by arranging long carbon fibers along the tooth shapes and then filling up inside with composite of glass fiber chops and epoxy resin. Bending strength of the tooth of the gear was studied experimentally and analytically. Availability of the fiber-reinforced plastic gear thus made was confirmed by the investigation.
7 citations
TL;DR: In this paper, the optimal structure for energy storage flywheels made of high specific strength fiber-reinforced plastics is discussed for maximizing energy densities (energy/weight and energy/volume).
Abstract: The optimal structure which maximizes energy densities (energy/weight and energy/volume) is discussed for energy storage flywheels made of high specific strength fiber-reinforced plastics. The results show that the density, thickness, and total stress i.e. sum of the radial and circumferential stresses should be constant in the flywheel. Additionally, the elastic moduli should be controlled so that the stresses are proportional to the strengths in the radial and circumferential directions.
3 citations